Recommend sticky tack, be sur to clean door
I recommend sticky tack - it is like putty but comes off surfaces fairly easily. I read the room steward is responsible for the door-please be courteous and clean any residue hence I'd avoid really sticky tapes.
I did see a neat door decor last trip--it was a metallic green grass and palm trees like the old "bead curtains" really caught my eye as we walked down hall. Definitely knew where your room was with that one.
I also saw a dry erase board--strange messages get posted on it!
Adventure of the Seas RC April 2008
Carnival Liberty April 2007
Carnival Miracle April 2005
Carnival Destiny June 2001, July 2005
NCL Southward June 1985 Honeymoon!